Birnessite
(Na,Ca,K)₀.₆(Mn⁴⁺,Mn³⁺)₂O₄·(H₂O)₁.₅
Hydroxide mineral
Properties
- Chemical formula
- (Na,Ca,K)₀.₆(Mn⁴⁺,Mn³⁺)₂O₄·(H₂O)₁.₅
- Group
- Oxides
- Crystal system
- —
- Hardness (Mohs)
- —
- Color
- Brown
- Luster
- —
- Streak
- —
- Density
- 1,5 g/cm³
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- —
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 4.FL.45
- Dana classification
- —
- IMA status
- Grandfathered mineral (G)
- IMA symbol
- Bir
- Locality
- 🇬🇧 Birness (Ellon)
- Type locality
- —
- Discovery year
- —
Etymology
Named after Birness (Ellon)
Source: Wikidata
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